drivers/regulator/pcf50633-regulator.c

   1 /* NXP PCF50633 PMIC Driver
   2  *
   3  * (C) 2006-2008 by Openmoko, Inc.
   4  * Author: Balaji Rao <balajirrao@openmoko.org>
   5  * All rights reserved.
   6  *
   7  * Broken down from monstrous PCF50633 driver mainly by
   8  * Harald Welte and Andy Green and Werner Almesberger
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/device.h>
  21 #include <linux/err.h>
  22 #include <linux/platform_device.h>
  23
  24 #include <linux/mfd/pcf50633/core.h>
  25 #include <linux/mfd/pcf50633/pmic.h>
  26
  27 #define PCF50633_REGULATOR(_name, _id, _n)              \
  28         {                                       \
  29                 .name = _name,                  \
  30                 .id = _id,                      \
  31                 .ops = &pcf50633_regulator_ops, \
  32                 .n_voltages = _n, \
  33                 .type = REGULATOR_VOLTAGE,      \
  34                 .owner = THIS_MODULE,           \
  35         }
  36
  37 static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
  38         [PCF50633_REGULATOR_AUTO]       = PCF50633_REG_AUTOOUT,
  39         [PCF50633_REGULATOR_DOWN1]      = PCF50633_REG_DOWN1OUT,
  40         [PCF50633_REGULATOR_DOWN2]      = PCF50633_REG_DOWN2OUT,
  41         [PCF50633_REGULATOR_MEMLDO]     = PCF50633_REG_MEMLDOOUT,
  42         [PCF50633_REGULATOR_LDO1]       = PCF50633_REG_LDO1OUT,
  43         [PCF50633_REGULATOR_LDO2]       = PCF50633_REG_LDO2OUT,
  44         [PCF50633_REGULATOR_LDO3]       = PCF50633_REG_LDO3OUT,
  45         [PCF50633_REGULATOR_LDO4]       = PCF50633_REG_LDO4OUT,
  46         [PCF50633_REGULATOR_LDO5]       = PCF50633_REG_LDO5OUT,
  47         [PCF50633_REGULATOR_LDO6]       = PCF50633_REG_LDO6OUT,
  48         [PCF50633_REGULATOR_HCLDO]      = PCF50633_REG_HCLDOOUT,
  49 };
  50
  51 /* Bits from voltage value */
  52 static u8 auto_voltage_bits(unsigned int millivolts)
  53 {
  54         if (millivolts < 1800)
  55                 return 0;
  56         if (millivolts > 3800)
  57                 return 0xff;
  58
  59         millivolts -= 625;
  60
  61         return millivolts / 25;
  62 }
  63
  64 static u8 down_voltage_bits(unsigned int millivolts)
  65 {
  66         if (millivolts < 625)
  67                 return 0;
  68         else if (millivolts > 3000)
  69                 return 0xff;
  70
  71         millivolts -= 625;
  72
  73         return millivolts / 25;
  74 }
  75
  76 static u8 ldo_voltage_bits(unsigned int millivolts)
  77 {
  78         if (millivolts < 900)
  79                 return 0;
  80         else if (millivolts > 3600)
  81                 return 0x1f;
  82
  83         millivolts -= 900;
  84         return millivolts / 100;
  85 }
  86
  87 /* Obtain voltage value from bits */
  88 static unsigned int auto_voltage_value(u8 bits)
  89 {
  90         if (bits < 0x2f)
  91                 return 0;
  92
  93         return 625 + (bits * 25);
  94 }
  95
  96
  97 static unsigned int down_voltage_value(u8 bits)
  98 {
  99         return 625 + (bits * 25);
 100 }
 101
 102
 103 static unsigned int ldo_voltage_value(u8 bits)
 104 {
 105         bits &= 0x1f;
 106
 107         return 900 + (bits * 100);
 108 }
 109
 110 static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
 111                                           int min_uV, int max_uV,
 112                                           unsigned *selector)
 113 {
 114         struct pcf50633 *pcf;
 115         int regulator_id, millivolts;
 116         u8 volt_bits, regnr;
 117
 118         pcf = rdev_get_drvdata(rdev);
 119
 120         regulator_id = rdev_get_id(rdev);
 121         if (regulator_id >= PCF50633_NUM_REGULATORS)
 122                 return -EINVAL;
 123
 124         millivolts = min_uV / 1000;
 125
 126         regnr = pcf50633_regulator_registers[regulator_id];
 127
 128         switch (regulator_id) {
 129         case PCF50633_REGULATOR_AUTO:
 130                 volt_bits = auto_voltage_bits(millivolts);
 131                 break;
 132         case PCF50633_REGULATOR_DOWN1:
 133                 volt_bits = down_voltage_bits(millivolts);
 134                 break;
 135         case PCF50633_REGULATOR_DOWN2:
 136                 volt_bits = down_voltage_bits(millivolts);
 137                 break;
 138         case PCF50633_REGULATOR_LDO1:
 139         case PCF50633_REGULATOR_LDO2:
 140         case PCF50633_REGULATOR_LDO3:
 141         case PCF50633_REGULATOR_LDO4:
 142         case PCF50633_REGULATOR_LDO5:
 143         case PCF50633_REGULATOR_LDO6:
 144         case PCF50633_REGULATOR_HCLDO:
 145                 volt_bits = ldo_voltage_bits(millivolts);
 146                 break;
 147         default:
 148                 return -EINVAL;
 149         }
 150
 151         *selector = volt_bits;
 152
 153         return pcf50633_reg_write(pcf, regnr, volt_bits);
 154 }
 155
 156 static int pcf50633_regulator_voltage_value(enum pcf50633_regulator_id id,
 157                                                 u8 bits)
 158 {
 159         int millivolts;
 160
 161         switch (id) {
 162         case PCF50633_REGULATOR_AUTO:
 163                 millivolts = auto_voltage_value(bits);
 164                 break;
 165         case PCF50633_REGULATOR_DOWN1:
 166                 millivolts = down_voltage_value(bits);
 167                 break;
 168         case PCF50633_REGULATOR_DOWN2:
 169                 millivolts = down_voltage_value(bits);
 170                 break;
 171         case PCF50633_REGULATOR_LDO1:
 172         case PCF50633_REGULATOR_LDO2:
 173         case PCF50633_REGULATOR_LDO3:
 174         case PCF50633_REGULATOR_LDO4:
 175         case PCF50633_REGULATOR_LDO5:
 176         case PCF50633_REGULATOR_LDO6:
 177         case PCF50633_REGULATOR_HCLDO:
 178                 millivolts = ldo_voltage_value(bits);
 179                 break;
 180         default:
 181                 return -EINVAL;
 182         }
 183
 184         return millivolts * 1000;
 185 }
 186
 187 static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
 188 {
 189         struct pcf50633 *pcf;
 190         int regulator_id;
 191         u8 volt_bits, regnr;
 192
 193         pcf = rdev_get_drvdata(rdev);
 194
 195         regulator_id = rdev_get_id(rdev);
 196         if (regulator_id >= PCF50633_NUM_REGULATORS)
 197                 return -EINVAL;
 198
 199         regnr = pcf50633_regulator_registers[regulator_id];
 200
 201         volt_bits = pcf50633_reg_read(pcf, regnr);
 202
 203         return pcf50633_regulator_voltage_value(regulator_id, volt_bits);
 204 }
 205
 206 static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
 207                                                 unsigned int index)
 208 {
 209         struct pcf50633 *pcf;
 210         int regulator_id;
 211
 212         pcf = rdev_get_drvdata(rdev);
 213
 214         regulator_id = rdev_get_id(rdev);
 215
 216         switch (regulator_id) {
 217         case PCF50633_REGULATOR_AUTO:
 218                 index += 0x2f;
 219                 break;
 220         case PCF50633_REGULATOR_HCLDO:
 221                 index += 0x01;
 222                 break;
 223         default:
 224                 break;
 225         }
 226
 227         return pcf50633_regulator_voltage_value(regulator_id, index);
 228 }
 229
 230 static int pcf50633_regulator_enable(struct regulator_dev *rdev)
 231 {
 232         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 233         int regulator_id;
 234         u8 regnr;
 235
 236         regulator_id = rdev_get_id(rdev);
 237         if (regulator_id >= PCF50633_NUM_REGULATORS)
 238                 return -EINVAL;
 239
 240         /* The *ENA register is always one after the *OUT register */
 241         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 242
 243         return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
 244                                                        PCF50633_REGULATOR_ON);
 245 }
 246
 247 static int pcf50633_regulator_disable(struct regulator_dev *rdev)
 248 {
 249         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 250         int regulator_id;
 251         u8 regnr;
 252
 253         regulator_id = rdev_get_id(rdev);
 254         if (regulator_id >= PCF50633_NUM_REGULATORS)
 255                 return -EINVAL;
 256
 257         /* the *ENA register is always one after the *OUT register */
 258         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 259
 260         return pcf50633_reg_set_bit_mask(pcf, regnr,
 261                                         PCF50633_REGULATOR_ON, 0);
 262 }
 263
 264 static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
 265 {
 266         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 267         int regulator_id = rdev_get_id(rdev);
 268         u8 regnr;
 269
 270         regulator_id = rdev_get_id(rdev);
 271         if (regulator_id >= PCF50633_NUM_REGULATORS)
 272                 return -EINVAL;
 273
 274         /* the *ENA register is always one after the *OUT register */
 275         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 276
 277         return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
 278 }
 279
 280 static struct regulator_ops pcf50633_regulator_ops = {
 281         .set_voltage = pcf50633_regulator_set_voltage,
 282         .get_voltage = pcf50633_regulator_get_voltage,
 283         .list_voltage = pcf50633_regulator_list_voltage,
 284         .enable = pcf50633_regulator_enable,
 285         .disable = pcf50633_regulator_disable,
 286         .is_enabled = pcf50633_regulator_is_enabled,
 287 };
 288
 289 static struct regulator_desc regulators[] = {
 290         [PCF50633_REGULATOR_AUTO] =
 291                 PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 80),
 292         [PCF50633_REGULATOR_DOWN1] =
 293                 PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1, 95),
 294         [PCF50633_REGULATOR_DOWN2] =
 295                 PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2, 95),
 296         [PCF50633_REGULATOR_LDO1] =
 297                 PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1, 27),
 298         [PCF50633_REGULATOR_LDO2] =
 299                 PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2, 27),
 300         [PCF50633_REGULATOR_LDO3] =
 301                 PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3, 27),
 302         [PCF50633_REGULATOR_LDO4] =
 303                 PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4, 27),
 304         [PCF50633_REGULATOR_LDO5] =
 305                 PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5, 27),
 306         [PCF50633_REGULATOR_LDO6] =
 307                 PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6, 27),
 308         [PCF50633_REGULATOR_HCLDO] =
 309                 PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO, 26),
 310         [PCF50633_REGULATOR_MEMLDO] =
 311                 PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO, 0),
 312 };
 313
 314 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
 315 {
 316         struct regulator_dev *rdev;
 317         struct pcf50633 *pcf;
 318
 319         /* Already set by core driver */
 320         pcf = dev_to_pcf50633(pdev->dev.parent);
 321
 322         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 323                                   pdev->dev.platform_data, pcf, NULL);
 324         if (IS_ERR(rdev))
 325                 return PTR_ERR(rdev);
 326
 327         platform_set_drvdata(pdev, rdev);
 328
 329         if (pcf->pdata->regulator_registered)
 330                 pcf->pdata->regulator_registered(pcf, pdev->id);
 331
 332         return 0;
 333 }
 334
 335 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
 336 {
 337         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 338
 339         platform_set_drvdata(pdev, NULL);
 340         regulator_unregister(rdev);
 341
 342         return 0;
 343 }
 344
 345 static struct platform_driver pcf50633_regulator_driver = {
 346         .driver = {
 347                 .name = "pcf50633-regltr",
 348         },
 349         .probe = pcf50633_regulator_probe,
 350         .remove = __devexit_p(pcf50633_regulator_remove),
 351 };
 352
 353 static int __init pcf50633_regulator_init(void)
 354 {
 355         return platform_driver_register(&pcf50633_regulator_driver);
 356 }
 357 subsys_initcall(pcf50633_regulator_init);
 358
 359 static void __exit pcf50633_regulator_exit(void)
 360 {
 361         platform_driver_unregister(&pcf50633_regulator_driver);
 362 }
 363 module_exit(pcf50633_regulator_exit);
 364
 365 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 366 MODULE_DESCRIPTION("PCF50633 regulator driver");
 367 MODULE_LICENSE("GPL");
 368 MODULE_ALIAS("platform:pcf50633-regulator");